/usr/share/doc/libqxt-gui0/changelog.Debian.gz is in libqxt-gui0 0.6.1-4ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libqxt-gui0/../libqxt-core0/changelog.Debian.gz
/usr/share/doc/libqxt-gui0/../libqxt-core0/changelog.Debian.gz